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Bones
The skeleton provides a series of independently movable levers which the muscles can pull to move different parts of the body.
It also supports and protects the internal body organs.
The skeleton produces red blood cells from the bone marrow of certain bones and white cells from the marrow of other bones to destroy harmful bacteria.

Muscles Muscle is attached to bone by tendons and it exerts force by converting chemical energy into tension and contraction.
They allow us to move by simply contracting and becoming shorter.
Muscles pull but they cannot push.
Muscles are made of tiny protein filaments.